11512343244221 has 4 divisors (see below), whose sum is σ = 11909320597500. Its totient is φ = 11115365890944.

The previous prime is 11512343244161. The next prime is 11512343244247. The reversal of 11512343244221 is 12244234321511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7106164416121 + 4406178828100 = 2665739^2 + 2099090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11512343244221 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11512343241221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198488676596 + ... + 198488676653.

It is an arithmetic number, because the mean of its divisors is an integer number (2977330149375).

Almost surely, 2^{11512343244221} is an apocalyptic number.

It is an amenable number.

11512343244221 is a deficient number, since it is larger than the sum of its proper divisors (396977353279).

11512343244221 is an equidigital number, since it uses as much as digits as its factorization.

11512343244221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396977353278.

The product of its digits is 46080, while the sum is 35.

Adding to 11512343244221 its reverse (12244234321511), we get a palindrome (23756577565732).

The spelling of 11512343244221 in words is "eleven trillion, five hundred twelve billion, three hundred forty-three million, two hundred forty-four thousand, two hundred twenty-one".